Rabbi Menachem Mendel Hager (born November 28, 1957) is one of the two Grand Rabbis of the Viznitz (Admor Mviznitz) Hasidic dynasty in Bnei Brak and a current member of Moetzes Gedolei HaTorah (Council of great Torah Sages) of the Agudat Yisrael movement.
About a year after his Bar Mitzvah, he traveled to the United States to study in the Skverer Yeshiva.
In 1976, he married Rebbetzin Miriam, daughter of Rabbi Avrohom Dovid Horowitz (deceased) who served as the Chief Rabbi of the Ultra-orthodox community in Strasbourg, France, and later as a member of the Edah HaChareidis in Jerusalem.
In 2009, he founded his synagogue and Yeshiva on Shlomo Hamelech Street, which is located near the Vizhnitz neighborhood.
Despite the dispute in the past, the two brothers currently maintain a good relationship and attend each other's family events.